Provable

Provable Markets is a New York and Amsterdam based financial technology firm operating Aurora, the first new SEC-registered Alternative Trading System (ATS) for securities finance in over a decade. Through Aurora Marketplace and Aurora Trade Manager, Provable delivers front-, middle-, and back-office technology for the securities lending market: automated trade matching, contract lifecycle management (returns, recalls, marks, rate changes), and CCP connectivity via NSCC. Its cloud-native platform exposes open APIs — a Connect/gRPC Aurora API, FIX specifications, and WebSocket/webhook event streams — and it is a FINRA member registered as an SEC ATS with SOC 2 and ISO 27001 certifications.

Provable is listed with 1 API on the APIs.io network. Tagged areas include Company, Securities Lending, Capital Markets, Fintech, and Trading.

The Provable catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Provable’s developer surface includes documentation, API reference, support, engineering blog, authentication, changelog, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

35.2/100 thin ▬ flat Agent 33/100 agent ready Front door AI 1/6 silent Heartbeat 60/100 slowing saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

1 API 2 Agent Skills

Company Securities Lending Capital Markets Fintech Trading Alternative Trading System Post-Trade gRPC FIX

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 35.2/100 · thin

Contract Quality 8.3 / 21

Developer Ergonomics 4.1 / 17

Access Clarity 4.9 / 17

Operational Transparency 2.6 / 11

Contract Governance 1.9 / 10

Discoverability 6.2 / 9

Regulatory Posture 5.3 / 15

Agent readiness — 33/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 39.0 — up to +15.3 composite points
Developer Ergonomics scores 24.4 — up to +15.1 composite points
Access Clarity scores 28.9 — up to +14.2 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/provable/apis.yml: open an issue on github.com/api-evangelist/provable to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Buf Schema Registry (public Protocol Buffers modules, gRPC / ConnectRPC schema publishers)	standard	17.2 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

gRPC

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Aurora API

The Aurora Connect (Buf) API for the SEC-registered securities-finance ATS — authentication, company/instrument reference, order management (OMS), venue order book, contract req...

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

Manage an Aurora securities-lending contract lifecycle

AGENT SKILL

Place and manage a securities-lending order on Aurora

AGENT SKILL

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Provable Events Webhooks

ASYNCAPI

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Provable Authentication

apiKey/http · 2 schemes

SECURITY

Provable Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

Webhooks

Conformance

Lifecycle

DataModel

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Compliance

Compliance

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Support

Support

ChangeLog

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: provable
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/provable.png
name: Provable
description: 'Provable Markets is a New York and Amsterdam based financial technology firm operating Aurora, the first new
  SEC-registered Alternative Trading System (ATS) for securities finance in over a decade. Through Aurora Marketplace and
  Aurora Trade Manager, Provable delivers front-, middle-, and back-office technology for the securities lending market: automated
  trade matching, contract lifecycle management (returns, recalls, marks, rate changes), and CCP connectivity via NSCC. Its
  cloud-native platform exposes open APIs — a Connect/gRPC Aurora API, FIX specifications, and WebSocket/webhook event streams
  — and it is a FINRA member registered as an SEC ATS with SOC 2 and ISO 27001 certifications.'
url: https://raw.githubusercontent.com/api-evangelist/provable/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- anthemis
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Company
- Securities Lending
- Capital Markets
- Fintech
- Trading
- Alternative Trading System
- Post-Trade
- gRPC
- FIX
apis:
- name: Aurora API
  description: The Aurora Connect (Buf) API for the SEC-registered securities-finance ATS — authentication, company/instrument
    reference, order management (OMS), venue order book, contract requests, contract lifecycle (returns/recalls), executions,
    agreements, and server-initiated event streams over gRPC, gRPC-Web, and Connect-HTTP.
  humanURL: https://developer.provablemarkets.com
  baseURL: https://provablemarkets.com/api/1
  properties:
  - type: Documentation
    url: https://developer.provablemarkets.com/workflows
  - type: APIReference
    url: https://developer.provablemarkets.com/api/connectapi
  - type: GettingStarted
    url: https://developer.provablemarkets.com/workflows
common:
- type: Website
  url: https://www.provablemarkets.com/
- type: DomainSecurity
  url: security/provable-domain-security.yml
- type: DeveloperPortal
  url: https://developer.provablemarkets.com
- type: Documentation
  url: https://developer.provablemarkets.com/workflows
- type: APIReference
  url: https://developer.provablemarkets.com/api/connectapi
- type: Support
  url: https://provablemarkets.com/contact
- type: Blog
  url: https://provablemarkets.com/news-insights
- type: TermsOfService
  url: https://provablemarkets.com/terms-conditions
- type: PrivacyPolicy
  url: https://provablemarkets.com/privacy-policy
- type: Compliance
  url: https://provablemarkets.com/
- type: LLMsTxt
  url: llms/provable-llms.txt
- type: WellKnown
  url: well-known/provable-well-known.yml
- type: Authentication
  url: authentication/provable-authentication.yml
- type: Conventions
  url: conventions/provable-conventions.yml
- type: Webhooks
  url: asyncapi/provable-events-webhooks.yml
- type: X-MCPServerCandidate
  url: mcp/provable-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: Conformance
  url: conformance/provable-conformance.yml
- type: Lifecycle
  url: lifecycle/provable-lifecycle.yml
- type: ChangeLog
  url: changelog/provable-changelog.yml
- type: DataModel
  url: data-model/provable-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 15
  pass: local-v1

Provable API — frequently asked questions

Does Provable have an API?

Yes. APIs.io lists 1 API from Provable, including Aurora API.

How do I authenticate with the Provable API?

Provable documents its authentication (apiKey/http · 2 schemes). The details are profiled on APIs.io as Provable Authentication.

Is the Provable API ready for AI agents?

Provable has a Kin Score of 35.2 out of 100 (thin) and an Agent Readiness score of 33.3 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

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get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
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